Master Joe's famous trio (4)

I believe the answer is:

magi

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'master joe's famous trio' is the definition.
I can't judge whether this definition defines the answer.

'master joe's' is the wordplay.
'master' becomes 'ma' (Master of Arts).
'joe' becomes 'GI' (GI Joe).
'ma'+'gi'='MAGI'

Can you help me to learn more?

(Other definitions for magi that I've seen before include "Christmas travellers" , "Biblical wise men" , "Priests" , "Bearers of gold, frankincense and myrrh?" , "Travellers in NT" .)

I've seen this clue in the Evening Standard.

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